toolchain: glibc: Update glibc to version 2.31

This updates glibc to the most recent version 2.31.

001-regex-read-overrun.patch was a backport from a more recent version
and is integrated in glibc 2.31.

050-Revert-Disallow-use-of-DES-encryption-functions-in-n.patch is needed
to add the DES crypto functions back again. They were removed in glibc
2.28, but we still use them in ppp.
musl lib also provides these DES crypto functions. Without them we would
have to link ppp against openssl or an other crypto library.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

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